Supercritical once-through boiler capable of firing eastern Junggar coal

Abstract

The invention discloses a supercritical once-through boiler capable of firing eastern Junggar coal, and relates to a supercritical once-through boiler which can be used by a thermal power station and is capable of safely and completely firing eastern Junggar coal for a long time. The supercritical once-through boiler comprises a hearth, a combustor, a divider screen superheater, a screen-type superheater, a high-temperature superheater, a high-temperature reheater, a flue deflection corner, a low-temperature reheater, an air-flue ejector shutoff barrier, a temperature regulating air-flue ejector, an ejector hot primary air regulating barrier, an ejector disable protection cooling air barrier, a separation secondary air bellow and a coal economizer. The ejector hot primary air regulating barrier is started when low and medium loads of the boiler and / or fouling factors of the reheaters are increased, so that the weight flow of temperature regulating flue and air mixtures can be adjusted between 0% and 30% of BMCR (boiler maximum continuous rating) flue gas weight flow. The supercritical once-through boiler has the advantages that the problem of severe slagging of an existing hearth in a eastern Junggar coal co-combustion procedure in the prior art can be solved; problems of fouling blockage corrosion of flue sides of high-temperature convection heating surfaces, increase of flue gas temperature, decrease of loading capacity and incapability of safely and completely combusting the eastern Junggar coal for a long time can be solved.

Description

(1) Technical field: [0001] The invention relates to a supercritical direct-current furnace using Zhundong coal, which relates to a supercritical direct-current furnace used in a thermal power station that can burn Zhundong coal in a long-term, safe and complete manner. (two) background technology: [0002] The Zhundong coalfield is a super-large coalfield located in Xinjiang, with predicted reserves of 3900×10 8 t, the mining cost is low. Zhundong coal has high moisture and volatile content, very low ash and sulfur content, and medium calorific value; Zhundong coal has an equivalent Na of about 1.0, which is a coal with serious pollution. [0003] When the power plant boilers in the prior art are blended with more than 40% of Zhundong coal, serious slagging occurs in the furnace burner area; High, load capacity decline and so on. When serious, the utility boiler of prior art is forced to shut down for maintenance. [0004] The main measures for the safe use of Zhundong ...

AI Technical Summary

Problems solved by technology

Solve the problem that the power plant boilers in the prior art cannot burn Zhundong coal in a long-term, safe and complete manner

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